Flowserve LPS Pneumatic Heavy-Duty Actuator Series - Manual (Page 16)

LPS Series Heavy-Duty Actuators FCD LFENIM0001-02-AQ – 5/15
16
3
Field Conversion
Field Conversion From Fail Clockwise to Fail Counter Clockwise or
Vice Versa (for Spring Return Actuators)
NOTE:
• The clockwise/counter clockwise designation needs to be changed on the nameplate.
• Additional adapters are required for field conversion from Fail CW to CCW and vice versa.
There are two different situations, requiring different sequences of instructions:
• The actuator is already disassembled from the valve.
• The actuator is assembled on the valve.
The reference drawings are Figures 24, 25, 26 and 27.
3.1 Actuator Disassembled From the Valve
a WARNING: Ensure that the pneumatic connection ports of the cylinder are disconnected. Also make sure that all
pneumatic supplies to the control unit and all power supplies are disconnected. Finally, make sure that the actuator
is in fail position, i.e., that it is not locked in a position with the spring
compressed by means of locking devices.
3.1.1 Unscrew and remove the end stop (25) from the pneumatic cylinder.
For removing the stop, refer to paragraph 2.3. If necessary, feed the
pneumatic cylinder from the port on the head flange (19) at minimum
necessary pressure to facilitate the movement of the Scotch yoke
and assure the total retraction of the piston rod (20). Remove the
pressure. In this way the spring is fully extended.
3.1.2 Remove the cover (46) from the housing by unscrewing all of the
locking components: hex screws (45), hex head shoulder bolts (44)
and eyebolts (42) plus upper nuts (43). Leave the studs (41) screwed
into the housing (51).